UBUNTU-CVE-2025-38036: Medium severity ubuntu/linux-hwe-edge vulnerability
In the Linux kernel, the following vulnerability has been resolved: drm/xe/vf: Perform early GT MMIO initialization to read GMDID VFs need to communicate with the GuC to obtain the GMDID value and existing GuC functions used for that assume that the GT has it's MMIO members already setup. However, due to recent refactoring the gt->mmio is initialized later, and any attempt by the VF to use xemmioread|write() from GuC functions will lead to NPD crash due to unset MMIO register address: [] xe 0000:00:02.1: [drm] Running in SR-IOV VF mode [] xe 0000:00:02.1: [drm] GT0: sending H2G MMIO 0x5507 [] BUG: unable to handle page fault for address: 0000000000190240 Since we are already tweaking the id and type of the primary GT to mimic it's a Media GT before initializing the GuC communication, we can also call xegtmmioinit() to perform early setup of the gt->mmio which will make those GuC functions work again.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
ubuntu/linux-aws-6.14to a version that resolves this vulnerability.Fixed in 6.14.0-1013.13~24.04.1 - Upgrade
Upgrade
ubuntu/linux-azure-nvidia-6.14to a version that resolves this vulnerability.Fixed in 6.14.0-1007.7 - Upgrade
Upgrade
ubuntu/linux-gcp-6.14to a version that resolves this vulnerability.Fixed in 6.14.0-1016.17~24.04.1 - Upgrade
Upgrade
ubuntu/linux-oem-6.14to a version that resolves this vulnerability.Fixed in 6.14.0-1012.12 - Upgrade
Upgrade
ubuntu/linux-oracle-6.14to a version that resolves this vulnerability.Fixed in 6.14.0-1013.13~24.04.1 - Upgrade
Upgrade
ubuntu/linux-riscv-6.14to a version that resolves this vulnerability.Fixed in 6.14.0-32.32.1~24.04.1 - Upgrade
Upgrade
ubuntu/linux-realtime-6.14to a version that resolves this vulnerability.Fixed in 6.14.0-1012.12~24.04.1 - Compensating control
For xe SR-IOV VF mode, call xe_gt_mmio_init() during early primary GT setup, before initializing GuC communication, so GT MMIO members are initialized before GuC functions use xe_mmio_read() or xe_mmio_write().